I'm trying to expand the application of your definition.
You on the other hand want to focus on your singular passage then apply that to the rest of scripture. This is done my many people to support a particular interpretation. The truth isn't found in applying your single definition to the whole of scripture, but instead comparing other scripture with it to see if it is so.
Actually, thats not correct, the Johnian 1 passages are just part of a larger contextual project that seeks
NOT to decontextualize the concept of who Jesus is.
Regarding our LORD Jesus Christ, we have 3 concepts to deal with:
1- Who was Jesus prior to His incarnation as the SON of God, (corporeal or incorporeal)
2- Who was Jesus between His birth and His resurrection, (The Father being still in heaven and Jesus communicating with Him).
3- Who is Jesus now, (corporeal or incorporeal)
As for my understanding of LORD in Gen 18. I can produce numerous old and new testament writings that no man has seen God. So who is LORD in Gen 18? To me it can only be Jesus before he humbled himself in the likeness and weakness of man, and being born from a virgin.
Or a theophany